MS11-L MOS memory

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The MS11-L was final UNIBUS main memory from DEC; a single card can hold enough MOS DRAM chips to fill the entire UNIBUS address space.

Fully populated with 16Kx1 chips, it is known as the MS11-LD, and holds 256K bytes. The quarter-, half- and three-quarter-populated versions are the MS11-LA, -LB and -LC, respectively; with 64KB, 128KB and 192KB. All versions include on-board parity support.

It plugs into a MUD backplane (only; not SPC). It is a single hex card, the M7891, so it cannot go in the end slots of the backplane.

The access time is 385 nsec (typical; 1025 nsec maximum on refresh conflict), and the cycle time is 510 nsec (1050 nsec maximum on refresh conflict). Refresh time is 570 nsec (typical; 610 nsec maximum); cycle time is 14.5 μsec (typical), 13.5 μsec (minimum).

The board has provision to use battery backup power to retain data during a power outage. Configuation is by DIP switches.